feat(spa): logs sort + page-size persistence, trash see-all paging (#213)

Blazor parity for the remaining #213 conveniences:

- GET /api/logs gains sortField (timestamp|level) and sortDirection
  (asc|desc) query params, allow-listed and normalized (unrecognized
  values fall back to the pre-existing timestamp-desc default) rather
  than rejected with a 422. LogsScreen.tsx renders clickable, sortable
  column headers with a chevron direction indicator.
- LogsScreen.tsx now persists the chosen page size to localStorage
  (ctv-logs-page-size) and restores it on mount, following the
  existing designSystem.ts localStorage-preference pattern. This is a
  client-local UI preference, not the Blazor ConfigElement-backed
  server setting — see docs/decisions.md.
- TrashScreen.tsx adds a per-kind "See all N ..." affordance that
  pages past the 100/kind /api/search cap using the already-paginated
  GET /api/library/browse (mediaType + pageNum), appending results
  client-side. No new API surface was needed since that endpoint
  already supports the paging the trash screen needed.

docs/decisions.md, docs/blazor-route-parity.md, docs/spa-conventions.md
and docs/api-conventions.md updated in this same commit. OpenAPI spec
regenerated (v1.d.ts unchanged: query params aren't part of the
generated components/schemas surface).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

web/src/shell.css

@@ -841,6 +841,26 @@ body {
   vertical-align: middle;
 }
 
+.ctv-logs-sort-button {
+  display: inline-flex;
+  align-items: center;
+  gap: 4px;
+  background: none;
+  border: none;
+  margin: 0;
+  padding: 0;
+  color: inherit;
+  font: inherit;
+  letter-spacing: inherit;
+  text-transform: inherit;
+  cursor: pointer;
+}
+
+.ctv-logs-sort-button:hover,
+.ctv-logs-sort-button:focus-visible {
+  color: var(--text-primary);
+}
+
 .ctv-channel-check {
   width: 38px;
   padding-left: 14px !important;
@@ -2898,6 +2918,12 @@ body {
   color: var(--text-secondary);
 }
 
+.ctv-media-section-footer {
+  display: flex;
+  justify-content: center;
+  margin: var(--space-5, 10px) 0 var(--space-7, 16px);
+}
+
 /* lineup */
 .ctv-builder-lineup-list {
   display: flex;